16502166217 has 4 divisors (see below), whose sum is σ = 16510067860. Its totient is φ = 16494264576.

The previous prime is 16502166211. The next prime is 16502166227. The reversal of 16502166217 is 71266120561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11528531641 + 4973634576 = 107371^2 + 70524^2 .

It is a cyclic number.

It is not a de Polignac number, because 16502166217 - 2⁷ = 16502166089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16502166211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3947688 + ... + 3951865.

It is an arithmetic number, because the mean of its divisors is an integer number (4127516965).

Almost surely, 2^16502166217 is an apocalyptic number.

It is an amenable number.

16502166217 is a deficient number, since it is larger than the sum of its proper divisors (7901643).

16502166217 is an equidigital number, since it uses as much as digits as its factorization.

16502166217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7901642.

The product of its (nonzero) digits is 30240, while the sum is 37.

Adding to 16502166217 its reverse (71266120561), we get a palindrome (87768286778).

The spelling of 16502166217 in words is "sixteen billion, five hundred two million, one hundred sixty-six thousand, two hundred seventeen".